<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<style>
		a:link{
			/*background-color: yellow;*/
			color: yellow;
		}
		a:visited{
			/*background-color: blue;*/
			color: blue;
		}
		a:hover{
			/*background-color: black;*/
			color: black;
		}
		a:active{
			/*background-color: purple;*/
			color: purple;
		}
	</style>
</head>
<body>
	<a href="#">这是个链接</a>
</body>
</html>